Professor Luke Nottage said the myth of infallible nuclear technology which existed in Japan has been smashed.

He added that the regulation of the industry is being improved but more could be done.

"And perhaps they will be a lot more attention paid to the international law framework.

"Japan hasn't signed up to major treaties in the field.

"But I think this all assumes that the nuclear power industry survives in Japan.

"But in the meantime of course they still have to rethink some of their approaches to safety and potentially another nuclear emergency and how the legal system and regulatory regime will respond to that."